[fionaB]

actually, the way i understand it is that you do not "need" by law a model release form in this country, and if the image was taken in a public place then there is no reasonable expectation of privacy so therefore you are not infringing anyones "right to privacy" which by the way is not a UK law its an EU law.
There are different laws up here to down south tho so i would check up.
Morally of course its always a good idea to get a model release form but realistically its not always possible.
As long as you are making it plain you are taking a picture and give people a chance to remove themselves then you can take the photo and do whatever you like with it that includes use it commercially.
In scotland you can take a photograph of anything as long as you are on public land when doing so.
if you go onto private property and there is a no photography policy then as soon as you take a shot you are legally trespassing.

just as an aside as well, its amazing how many people think its illegal to take photographs of children!
In scotland under the childrens act, a child of 13 is deemed able to give their own permission as long as they understand what is being asked of them. so in essence as long as you tell the child you are taking their photograph and the child says yep thats ok, it doesnt matter one hoot what their parents say ( as long as the kid is 13 or over).

fi
Fi